Key parameters at a glance
- A radius of 3.50 Earth radii
- A mass of 75.50 Earth masses
- Surface gravity around 6.16 g
- An orbital period of 42.994 days
- Semi-major axis 0.2407 AU
- Equilibrium temperature 496 K (223 °C)
- Distance from Earth 729.80 light-years
- Earth Similarity Index 0.444
- Travel time at Voyager 1 speed 12,869,967 years
1 sibling around Kepler-396
Kepler-396 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-396 b this | Sub-Neptune | 3.50 | 75.50 | 42.994 | 496 | 2013 |
| Kepler-396 c | Neptune-like | 5.30 | 17.90 | 88.505 | 390 | 2013 |
Kepler-396 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#182of 1978
top 9.2%
This planet
3.50R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-396 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.50 | 11.21 |
| Mass (M⊕) | 1.00 | 75.50 | 317.83 |
| Density (g/cm³) | 5.51 | 9.68 | 1.33 |
| Surface Gravity (g) | 1.00 | 6.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 13.73 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 75.500 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 27769688
Gaia DR2
Gaia DR2 2134847343119885440
Gaia DR3
Gaia DR3 2134847343121798528
System
Kepler-396
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 42.99 Earth days (11.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2407 AU.
Transit Fingerprint
Depth
0.111 %
Duration
4.601 h
Impact parameter b
0.480
Rp / R★
0.030168
Transit midpoint (BJD)
2,454,995.4984
Photometric dip
Transit produces a flux drop of 1,108 ppm lasting ≈ 4.60 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030168
Semi-major axis / stellar radius
72.950
Impact parameter (b)
0.480
Transit mid-time (BJD)
2,454,995.4984
Angular separation (arcsec)
1.08000
Eq. Temperature
496K
(223 °C)
Insolation (S⊕)
13.73
Earth = 1.00
Earth Similarity (ESI)
0.444
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Discovery cohort
Planets confirmed in 2013 at Kepler (12 shown).
Host System: Kepler-396
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,656 K — cooler than the Sun (5,778 K)
Estimated Age
0.62 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.060 R☉
Stellar Mass
0.850 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.320 dex
Stellar density
1.340 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
4.441 mas
Total Proper Motion
16.115 mas/yr
PM Right Ascension
2.46 mas/yr
PM Declination
-15.93 mas/yr
Galactic Cartesian (pc)
x = 0.289 · y = -0.589 · z = 0.754
Equatorial (J2000)
RA 296.13281° · Dec 48.97731°
Galactic ℓ, b
82.135° · 12.116°
Ecliptic λ, β
320.235° · 67.909°
HTM-20 index
1790813612
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TOI-2196 b
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